Self-securing device preventing a communication means from remaining in an undefined intermediate position

A self-securing device for securing a person, the self-securing device comprising:

• a first fastening element for fastening to a securing element;
• a second fastening element for fastening to the securing element or a further securing element;
• a communication means for communicating between the first fastening element and the second fastening element such that, in a first posture of the communication means, the first fastening element is actuatable and the second fastening element is locked, and, in a second posture of the communication means, the first fastening element is locked and the second fastening element is actuatable;
• and
• a control mechanism for controlling the communication means to prevent the communication means from remaining in an undefined intermediate posture between the first posture and the second posture,
• wherein the control mechanism comprises two juxtaposed first magnetic elements with respect to which a string of the communication means is movable, and a second magnetic element fixedly attached to the string.